Once support for Windows 10 native notifications is released, users who choose to use Windows notifications will be able to utilize Windows OS specific settings for the length of time to display notifications. Mac does not have an OS specific setting, so will not have the support.Gareth Oakes commented
Please don't forget about Mac. My boss has given up using Teams only because the notifications are impossible to spot on Mac when you have multiple screens, windows open, etc. If Teams was just able to use the built-in MacOS notifications system all would be solved.
We are continuing to work on this feature. As with Windows notifications, we are also doing work to give users the choice between Teams notifications & Mac notifications.
We will update you as work progresses.Gareth Oakes commented
Most of our Mac users have now moved on to other messaging systems, or back to Skype. This needs to be urgently addressed please!